TX Inhibit options

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TX Inhibit options

Roger Banks
Hi All.
I am using a K3 with internal 144 transverter module.
On 2m I use a sequencer for TX/RX as I use a PA and a LNA at the masthead.
The rig TX is triggered by the sequencer by using the PTT In line.
The sequencer ensures the rig is switched after the LNA. The sequencer is triggered either by a foot switch or by the signalink Data line.
The problem I have is that there is a HUGE risk (and I have done it) of inadvertantly using the manual TX button on the front of the K3. If this is done the rig goes to TX and teh sequencer is bypassed - thus blowing the LNA.. ouch.
This issue is compounded by the fact that on all other bands I need conventional operation of the ring as there is obviously no problem with sequencers elsewhere and you get used to using eiher ptt or the tx button.
Question then - is there a way of disabling/inhibiting the TX button/ mic socket ptt on the rig just on 2m so that on 2m you can only instigate TX via the back panel PTT in line?
Help appreciated!
Roger Banks
GW4WND
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Re: TX Inhibit options

G4BVY
Hi Roger
Different solution !  You could use TX DLY.  This delays the RF out from the
K3 (setable in mS steps).
Roger - G4BVY  

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Roger Banks
Sent: 29 June 2011 10:36
To: [hidden email]
Subject: [Elecraft] TX Inhibit options

Hi All.
I am using a K3 with internal 144 transverter module.
On 2m I use a sequencer for TX/RX as I use a PA and a LNA at the masthead.
The rig TX is triggered by the sequencer by using the PTT In line.
The sequencer ensures the rig is switched after the LNA. The sequencer is
triggered either by a foot switch or by the signalink Data line.
The problem I have is that there is a HUGE risk (and I have done it) of
inadvertantly using the manual TX button on the front of the K3. If this is
done the rig goes to TX and teh sequencer is bypassed - thus blowing the
LNA.. ouch.
This issue is compounded by the fact that on all other bands I need
conventional operation of the ring as there is obviously no problem with
sequencers elsewhere and you get used to using eiher ptt or the tx button.
Question then - is there a way of disabling/inhibiting the TX button/ mic
socket ptt on the rig just on 2m so that on 2m you can only instigate TX via
the back panel PTT in line?
Help appreciated!
Roger Banks
GW4WND

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Re: TX Inhibit options

Roger Banks
Ok Roger - thanks for the input.
TX-DLY is an option I suppose but that means the sequencer will not be sequencing in the right order. ( I dont know if that is an issue or not). The sequencer has to switch the LNA first then switches the PA and K3 over together to tx. TXDLY. If I use TXD then they will all have to go over together and maybe there is a risk of RF getting to the LNA with the amp in TX awaiting RF from the K3?
Roger
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Re: TX Inhibit options

John Lemay
It looks like TX delay is a max of 20ms, probably not enough for your
purpose.

John G4ZTR

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Roger Banks
Sent: 29 June 2011 11:19
To: [hidden email]
Subject: Re: [Elecraft] TX Inhibit options

Ok Roger - thanks for the input.
TX-DLY is an option I suppose but that means the sequencer will not be
sequencing in the right order. ( I dont know if that is an issue or not).
The sequencer has to switch the LNA first then switches the PA and K3 over
together to tx. TXDLY. If I use TXD then they will all have to go over
together and maybe there is a risk of RF getting to the LNA with the amp in
TX awaiting RF from the K3?
Roger

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Re: TX Inhibit options

Bruce Beford-2
In reply to this post by Roger Banks
Seems to me this -could- be done, but would require some modifications to
your sequencer system.
 
Using the TX INH input (pin 7 or AUX connector on the K3, set TX INH to ON).
You would need an output from your sequencer that stays low until TX
permission is desired. This operation would be dependant on the band the K3
is on, so you would need to add logic to decode the Band0-3 outputs, and set
CONFIG:KIO3 to TRN.
 
Alternatively, you could use a KRC2 to access the auxbus data out to decode
the TRN band.  Again, added logic would activate the inhibit function only
when 2M is selected, based on the output of the KRC2.
 
This is all based on reading the signal descriptions in the K3 manual. I
have not tried it. I am sure there are probably other ways to accomplish
this.
 
Good luck,
Bruce, N1RX
 
> Question then - is there a way of disabling/inhibiting the TX button/ mic
> socket ptt on the rig just on 2m so that on 2m you can only instigate TX
via
> the back panel PTT in line?
> Help appreciated!
> Roger Banks
> GW4WND
 

 

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Re: TX Inhibit options

Roger Banks
Thanks Bruce.
The sequencer is an SSB DCW2004 B. It does not seem to have a state-change output from rx to tx. It has inputs to earth or high to trigger the sequence and then delay outputs to sequence the devices.
So I am note sure that would work..
Roger
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Re: TX Inhibit options

Bruce Beford-2
In reply to this post by Roger Banks
Roger,
 
You would add your own output that would stay low until the sequencer out
for triggering the PTT on the rig is active. This output would also only
inhibit the rig when on 2M (a requirement you mentioned), by monitoring the
band data outputs of the radio. You would have to build this logic yourself,
and add it to your sequencer. (probably not enough time before this
weekend's VHF contest...) As I said, it would take some work. But what you
are asking for is insurance against operator error. How much does it cost
(in time and effort) to rebuild the LNA when you blow it?
 
Or, you could just stay away from that TX button... ;-)
73,
Bruce, N1RX
 
 
> Thanks Bruce.
> The sequencer is an SSB DCW2004 B. It does not seem to have a state-change
> output from rx to tx. It has inputs to earth or high to trigger the
sequence
> and then delay outputs to sequence the devices.
> So I am note sure that would work..
> Roger
 

 

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